Why is it always discussed that earth's gravity pulls all and why not something that pushes us from OUT to in?

Question

Let us all be innovative.

Answer 1

Because the further you get from the Earth, the less the pull, so it stands to reason that the pull is coming from the Earth.

Answer 2

Same thing unless you are implying the mass from the rest of the universe is responsible for gravity, pushing objects in. That doesn't work because take away the earth and you take away gravity, so push from rest of universe is very,very small if not zero. So earth must be pulling in. Push also implies gravity is repulsive, when it is not.

Answer 3

The Helium and hot air balloon do over come the gravity, force of gravity is more then buoyancy , the object stays on the earth.

The force of bouncy is greater then the gravity, the object rises up in the atmosphere.

Answer 4

The static electric force (Coulombic force) is attractive for unlike charges and repulsive for like charges. The gravitational force is only attractive. Physicists love symmetry, so they have looked intently for a repulsive force corresponding to gravity, both experimentally and theoretically. They haven't found one. But if there is, it will probably related to dark energy.

Answer 5

that's a very novel idea, but because there's basically nothing outside of the atmosphere because of the vast emptiness of space, nothing is really there to push. Also gravity pulling is a newtonian concept, when it actually is curvature in space that is causing the gravitational phenomenon.

Answer 6

There is no gravity, the earth just sucks. Is that innovative enough?

Answer 7

O.K., guys, here's something that's not only innovative but also happens to be the true scientific reason for the effects that we attribute to "gravity." (It's innovative in the sense that VERY few people think of it this way, even relativity specialists until they are REMINDED of the MEANING behind equations that texts generally gloss over.) I'll first concentrate on "PURELY NEWTONIAN" gravity, but also extend my discussion to the more general case.

FORGET for the time being about both "PULLING" and "PUSHING." Just think of "COASTING ALONG" in a world in which TIME RUNS DIFFERENTLY IN DIFFERENT PLACES! :

DESPITE all the popular discussions associating gravity from an Einsteinian point of view with the curvature of SPACE, per se, that is ABSOLUTELY WRONG! It addresses quite the wrong aspect of spacetime --- the rate at which time itself runs is by far the major factor for our everyday experience of gravity. This is VERY difficult to convey to the average member of the public!

Everything that we call Newtonian gravity exists SOLELY because the rate at which time runs anywhere is affected by the proximity of matter. Time in fact runs slower the closer one is to a local source of matter --- or, as one says in purely Newtonian physics, the deeper down one is in a gravitational well. The kinematic consequences of this fact about "variable time" make the paths of both light and matter bend. (I can't prove this here, but it CAN be proved. Let me simply say that it should not surprise you to know that if local time is a function of position, you're not going to get straight line motion!)

I repeat: every single aspect of NEWTONIAN GRAVITY follows straightforwardly from the fact that TIME RUNS DIFFERENTLY IN DIFFERENT PLACES. Everything moves AS THOUGH it IS attracted to matter with an inverse square law, and THAT latter fact is what Newton found and successfully described. There is no NEED to appeal to something PUSHING us in, when the resulting phenomena so clearly show that locally present matter manifests its properties in the resulting motion. It would gain you absolutely nothing to claim that such "pushing" has exactly the same functional form as the well-established theory. That theory explains gravity's strength in different places AND gravitational motion with such remarkable accuracy that humanity has been able to explore the solar system using triple or quadruple "gravitational slingshots" from the inner planets to attain that goal.

Let's get back to that variable rate of time's runnning as it affects us. The differences in the rate at which time runs are MINUSCULE in Earth's proximity. Take two identical clocks, set them both to show exactly the same time, and then place one at sea level, and the other on top of Mt Everest, at ~ 10,000 metres height.

QUESTION: How long would you have to wait before the times they show differ by just 1 SECOND? The answer is: ~30,000 years! Negligible though this difference appears to be, it's ENTIRELY RESPONSIBLE for terrestrially measured ' g ' being ~ 9.8 m/s^2. What's more, the difference in the rate at which time runs was actually measured in an incredibly ingenious experiment performed in the early 1960s, in a tower at Harvard, a tower only 70 feet high! That beautiful but difficult experiment won its two performers the Nobel Prize for confirming the deep relationship between gravity and the local running of time (otherwise known as the Einstein red-shift.)

This property of time running slower "the deeper down you go" can in fact be extended from the Newtonian into the fully relativistic regime. Ultimately, the "deepest down" you can go into a potential well is when you reach the surface, or "event horizon" of a black hole. THERE, time STOPS RUNNING altogether. The Russians actually have the best name for where this happens. OUR English term, "black hole," really refers to something happening OUTSIDE the region, namely the inability even of light to escape and then reach us. THEIR term is "FROZEN STAR." And WHAT is frozen? : the RUNNING OF TIME!

Back to the main point: The phenomena that we attribute to gravity follow entirely from kinematic "coasting" in spacetime. In weak field, slow speed (= Newtonian) situations, ONLY the changes in the local rates at which time runs have the SLIGHTEST effect. However, as both speeds and the field effects grow stronger, the curvature of space itself contributes to the consequences. In the strongest field, highest speed situations, space curvature and time-rate effects both compete in determining the outcomes.

As Walter Cronkite would say, "And that's the way it is."

Live long and prosper.

Answer 8

No, lets stick to the facts..